package com.seal.commons.utils.qrcode;

import com.google.zxing.LuminanceSource;

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

public class BufferedImageLuminanceSource extends LuminanceSource {
	
	private final BufferedImage image; 
	private final int left; 
	private final int top; 
	
	public BufferedImageLuminanceSource(BufferedImage image) { 
		this(image, 0, 0, image.getWidth(), image.getHeight()); 
	}
	
	public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) { 
		super(width, height);
		int sourceWidth = image.getWidth();
		int sourceHeight = image.getHeight();
		if (left + width > sourceWidth || top + height > sourceHeight) {
			throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
		}
		for (int y = top; y < top + height; y++) {
			for (int x = left; x < left + width; x++) {
				if ((image.getRGB(x, y) & 0xFF000000) == 0) {
					image.setRGB(x, y, 0xFFFFFFFF); // = white
				}
			}
		}
		this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);
		this.image.getGraphics().drawImage(image, 0, 0, null);
		this.left = left;
		this.top = top;
	}
	
	@Override
	public byte[] getRow(int y, byte[] row) {
		if (y < 0 || y >= getHeight()) { 
			throw new IllegalArgumentException("Requested row is outside the image: " + y); 
		} 
		int width = getWidth(); 
		if (row == null || row.length < width) { 
			row = new byte[width]; 
		} 
		image.getRaster().getDataElements(left, top + y, width, 1, row); 
		return row; 
	}
	
	@Override
	public byte[] getMatrix() {
		int width = getWidth(); 
		int height = getHeight(); 
		int area = width * height; 
		byte[] matrix = new byte[area]; 
		image.getRaster().getDataElements(left, top, width, height, matrix); 
		return matrix; 
	}
	
	@Override
	public boolean isCropSupported() { 
		return true; 
	}
	
	@Override
	public LuminanceSource crop(int left, int top, int width, int height) {
		return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height); 
	}
	
	@Override
	public boolean isRotateSupported() {
		return true;
	}
	
	@Override
	public LuminanceSource rotateCounterClockwise() {
		int sourceWidth = image.getWidth(); 
		int sourceHeight = image.getHeight(); 
		AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth); 
		BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY); 
		Graphics2D g = rotatedImage.createGraphics(); 
		g.drawImage(image, transform, null); 
		g.dispose(); 
		int width = getWidth(); 
		return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width); 
	}
}
